a broad flat muscle on either side of the back
"The athlete stretched his lat to prevent injury before lifting heavy weights."
Initialism of lowest astronomical tide.
"The ship sailed north to increase its latitude and avoid the stormy southern seas."
A staff, particularly one of an Indian kind.
A latrine: a rudimentary or military facility for urination and defecation.
The gold-backed monetary unit of Latvia from August 1922 until April 1941, when it was replaced by the Soviet ruble; it was typically pegged at about 25 to the British pound.
A latissimus dorsi muscle.
latitude
In plain English: A lat is an old-fashioned type of saw used to make long, flat pieces of wood by cutting along their length.
"The ship's current lat was 34 degrees north."
Usage: Use "lat" to refer specifically to either the historical Latvian currency from 1922-1941 or a basic outdoor toilet in military contexts. Avoid using this term for modern money or indoor restrooms unless discussing specific historical periods or field conditions.
Initialism of living apart together. (describing people in an intimate relationship who live at different addresses)
"After years of dating, they decided to stop being LAT so they could move into the same apartment."
In plain English: Lat is short for lateral, which means something that goes from side to side instead of up and down.
"They decided to try a lat arrangement to see if more space would improve their communication."
Initialism of Los Angeles Times.
"The article cited in lat as a primary source was actually written by an anonymous journalist."
The word "lat" was borrowed from the Hindi words lāṭ and lāṭh, which originally meant a pillar, minaret, or long staff. It entered English with this sense of a sturdy wooden pole or club.